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Oh is that what N-Vent is? I would have bought some a while back if I knew it was PETG. Taulman kindof shot themselves in the foot by being cryptic about the actual material... they lost at least 1 sale to me as a result

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First, t-glase is made from the highest optical quality PETT material and is currently only available from two chemical plants. Unlike other polymers, some PETT, including t-glase are not considered “transparent”. Instead, it belongs to a group of polymers that are considered “colorless” and or “colorless with a percentage of reflectivity”. t-glase is also considered “water-clear” and “optically correct”. The term “optically correct” simply means that if you have a lens based die and injection mold precision reflective PETT into the die, the resulting lens will be relatively close to the same lens made from glass. While there is no formal definition of “water-clear”, in optical engineering, it’s a reference to how high quality plate glass seems to disappear when placed in water. When a clean piece of high quality glass is placed in water, the water negates the flat surfaces as a reflective surface, thus making the major surface invisible. However, the edges of the plate glass will still redirect or reflect light in a different direction, thus making them viewable even in water. This water-clear property is why some of products we buy are displayed in “Blister-Pack” packaging. The material is based on PETT with processing that bring out it’s reflective properties and enhances the visual presentation of the product. Over and above the problems associated with removing said product from the packaging!

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